Sudoku is a number placing puzzle based on a 9x9 grid with several given numbers. The object is to place the numbers 1 to 9 in the empty squares so that each row, each column and each 3x3 box contains the same number only once. There are other variations of 8x8 and 6x6. Sudoku puzzles come in endless number combinations and range from very easy to extremely difficult taking anything from five minutes to several hours to solve. Sudoku puzzles also come in many variants, each variant looking differently and each variant offering a unique twist of brain challenging logic. The rules r Simple but in reality it is highly challenging. After much thought n consideration, u will feel an awesome sense of achievement and this will spur u on to compete in more challenges.